Mobile device and optical imaging lens thereof

ABSTRACT

The optical imaging lens includes, sequentially from an object side to an image side in order from an optical axis, first, second, third, fourth, and fifth lens elements. The first lens element is made of plastic. The object-side of the second lens element has a convex portion in a vicinity of the optical axis. The third lens element is made of plastic. The object-side surface of the fourth lens element has a concave portion in the vicinity of its periphery. The sum of thicknesses of all five lens elements along the optical axis is ALT, the distance between the image-side surface of the fifth lens element and an image plane along the optical axis is BFL, and the optical imaging lens satisfies the equation: 1.167≤ALT/BFL≤1.685.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/131,980, filed on Apr. 18, 2016, which is a continuation of U.S.patent application Ser. No. 14/537,846, filed on Nov. 10, 2014, now U.S.Pat. No. 9,341,821, which is a continuation of U.S. patent applicationSer. No. 13/779,727, filed on Feb. 27, 2013, now U.S. Pat. No.9,036,273, which claims priority to Taiwan Patent Application No.101137762, filed on Oct. 12, 2012, the contents of which are herebyincorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present invention relates to a mobile device and an optical imaginglens thereof, and more particularly, to a mobile device applying anoptical imaging lens having five lens elements and an optical imaginglens thereof.

BACKGROUND OF THE INVENTION

The ever-increasing demand for smaller sized mobile devices, such ascell phones, digital cameras, etc. has correspondingly triggered agrowing need for a small-sized photography module (comprising elementssuch as an optical imaging lens, a module housing unit, and an imagesensor, etc.) contained therein. Size reductions may be contributed fromvarious aspects of the mobile devices, which include not only thecharge-coupled device (CCD) and the complementary metal-oxidesemiconductor (CMOS), but also the optical imaging lens mounted therein.When reducing the size of the optical imaging lens, however, achievinggood optical characteristics becomes a challenge.

U.S. Patent Publication No. 2011176049, U.S. Patent Publication No.20110316969, and U.S. Pat. No. 7,480,105 all disclosed an opticalimaging lens constructed with an optical imaging lens having five lenselements. The negative refracting power of the first image lens is notbenefit to shorten the length of the optical imaging lens and sustaingood optical characteristics.

U.S. Patent Publication No. 20120105704, U.S. Patent Publication No.20110013069, R.O.C. Patent Publication No. 2012027044, and R.O.C. PatentNo. M369459 all disclosed an optical imaging lens constructed with anoptical imaging lens having five lens elements. The thickness of thefifth lens elements is thicker and unfavorable for shortening the lengthof the imaging lens.

U.S. Patent Publication No. 20100254029, U.S. Patent Publication No.20120069455, U.S. Patent Publication No. 20120087019, U.S. PatentPublication No. 20120087020, and R.O.C. Patent Publication No.2012013926 all disclosed an optical imaging lens constructed with anoptical imaging lens having five lens elements. The sum of all air gapsbetween the lens elements is excessive. Meanwhile, the length of theoptical imaging lens disclosed in U.S. Patent Publication No.20100254029 is greater than 8.5 mm, and this is unfavorable forendeavoring slimmer mobile devices, such as cell phones and digitalcameras.

How to effectively shorten the length of the optical imaging lens andhow to provide good imaging quality are the most important topics in theindustry to pursue the trend of smaller and smaller mobile devices.Therefore, there is a need to develop optical imaging lens with ashorter length, while also having good optical characteristics.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a mobile device and anoptical imaging lens thereof. By controlling the convex or concave shapeand/or the refracting power of the surfaces of the lens elements, thelength of the optical imaging lens is shortened and meanwhile the goodoptical characteristics, such as high resolution, and systemfunctionality are sustained.

In an exemplary embodiment, an optical imaging lens comprises,sequentially from an object side to an image side, first, second, third,fourth and fifth lens elements, each of said first, second, third,fourth and fifth lens elements having an object-side surface facingtoward the object side and an image-side surface facing toward the imageside, wherein: the first lens element has a positive refracting power,and the object-side surface thereof is a convex surface; the second lenselement has a negative refracting power; the third lens element has apositive refracting power; the image-side surface of the fourth lenselement is a convex surface; the object-side surface of the fifth lenselement comprises a concave portion in a vicinity of the optical axis,and the image-side surface of the fifth lens element comprises a concaveportion in a vicinity of the optical axis and a convex portion in avicinity of a periphery of the fifth lens element; and the opticalimaging lens as a whole having only the five lens elements havingrefracting power.

In another exemplary embodiment, other related parameters, such as acentral thickness of a lens element along the optical axis and or theratio among a central thickness of a lens element along the optical axisand the sum of all air gaps can be controlled to achieve good opticalcharacteristics. For example, an air gap between the second lens elementand the third lens element along the optical axis, G₂₃, and an air gapbetween the fourth lens element and the fifth lens element along theoptical axis, G₄₅, could be controlled to satisfy the equation asfollows:0≤G ₂₃ −G ₄₅ (mm);0.1≤G ₂₃ −G ₄₅ (mm); or0≤G ₂₃ −G ₄₅≤0.2 (mm).

For example, the sum of all four air gaps from the first lens element tothe fifth lens element along the optical axis, G_(aa), and a centralthickness of the fifth lens element along the optical axis, T₅, could becontrolled to satisfy the equation as follows:

${2.3 \leq \frac{G_{aa}}{T_{5}}};{{{or}\mspace{14mu} 2.6} \leq {\frac{G_{aa}}{T_{5}}.}}$

For example, G₂₃ and an air gap between the first lens element and thesecond lens element along the optical axis, G₁₂, could be controlled tosatisfy the equation as follows:

${2 \leq \frac{G_{23}}{G_{12}}};{{{or}\mspace{14mu} 2} \leq \frac{G_{23}}{G_{12}} \leq {7.5.}}$

For example, the total thickness of all five lens elements, ALT, and acentral thickness of the second lens element along the optical axis, T₂,could be controlled to satisfy the equation as follows:

${6.5 \leq \frac{ALT}{T_{2}}};{{{or}\mspace{14mu} 6.5} \leq \frac{ALT}{T_{2}} \leq 10.}$

For example, a central thickness of the second lens element along theoptical axis is T₂, and an air gap between the fourth lens element andthe fifth lens element along the optical axis is G₄₅, T₂ and G₄₅ satisfythe equation: 1.74≤T₂/G₄₅≤2.47.

For example, a distance (air gap) between the image-side surface of thefifth lens element and an image plane along the optical axis is BFL, andG₄₅ and BFL satisfy the equation: 3.93≤BFL/G₄₅≤5.39.

For example, a distance between the object-side surface of the firstlens element and an image plan is TTL, a central thickness of the fifthlens element along the optical axis is T₅, and TTL and T₅ satisfy theequation: 10.29≤TTL/T₅≤21.50.

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

In some exemplary embodiments, an aperture stop could be furthercomprised for adjusting the light intensity entering into the system.The aperture stop is exemplarily but not limited to be positioned beforethe first imaging lens.

In some exemplary embodiments, more details about the convex or concavesurface structure could be incorporated for one specific lens element orbroadly for plural lens elements to enhance the control for the systemperformance and/or resolution. For example, the object-side surface ofthe third lens element could comprise a concave portion in a vicinity ofthe optical axis.

In another exemplary embodiment, a mobile device comprises a housing anda photography module positioned in the housing. The photography modulecomprises any of aforesaid example embodiments of optical imaging lens,a lens barrel, a module housing unit, and an image sensor. The lensbarrel is for positioning the optical imaging lens, the module housingunit is for positioning the lens barrel, and the image sensor ispositioned at the image-side of the optical imaging lens.

In some exemplary embodiments, the module housing unit optionallycomprises a lens backseat comprising a first seat element and a secondseat element, the first seat element is positioned close to the outsideof the lens barrel and along with an axis for driving the lens barreland the optical imaging lens positioned therein to move along the axis,and the second seat element is positioned along the axis and around theoutside of the first seat element.

In some exemplary embodiments, the module housing unit optionallyfurther comprises an image sensor base positioned between the secondseat element and the image sensor, and the image sensor base contactswith the second seat element.

Through controlling the convex or concave shape of the surfaces and/orthe refracting power of the lens element(s), the mobile device and theoptical imaging lens thereof in exemplary embodiments achieve goodoptical characters and effectively shorten the length of the opticalimaging lens.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 is a cross-sectional view of a first embodiment of an opticalimaging lens having five lens elements according to the presentdisclosures;

FIG. 2 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a first embodiment of the optical imaging lensaccording to the present disclosures;

FIG. 3 is a cross-sectional view of a lens element of the opticalimaging lens of an example embodiment of the present disclosures;

FIG. 4 is a table of optical data for each lens element of a firstembodiment of an optical imaging lens according to the presentdisclosures;

FIG. 5 is a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosures;

FIG. 6 is a cross-sectional view of a second embodiment of an opticalimaging lens having five lens elements according to the presentdisclosures;

FIG. 7 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a second embodiment of the optical imaginglens according to the present disclosures;

FIG. 8 is a table of optical data for each lens element of the opticalimaging lens of a second embodiment of the present disclosures;

FIG. 9 is a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosures;

FIG. 10 is a cross-sectional view of a third embodiment of an opticalimaging lens having five lens elements according to the presentdisclosures;

FIG. 11 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a third embodiment of the optical imaging lensaccording the present disclosures;

FIG. 12 is a table of optical data for each lens element of the opticalimaging lens of a third embodiment of the present disclosures;

FIG. 13 is a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosures;

FIG. 14 is a cross-sectional view of a fourth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosures;

FIG. 15 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fourth embodiment of the optical imaginglens according the present disclosures;

FIG. 16 is a table of optical data for each lens element of the opticalimaging lens of a fourth embodiment of the present disclosures;

FIG. 17 is a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosures;

FIG. 18 is a cross-sectional view of a fifth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosures;

FIG. 19 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fifth embodiment of the optical imaging lensaccording the present disclosures;

FIG. 20 is a table of optical data for each lens element of the opticalimaging lens of a fifth embodiment of the present disclosures;

FIG. 21 is a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosures;

FIG. 22 is a cross-sectional view of a sixth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosures;

FIG. 23 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a sixth embodiment of the optical imaging lensaccording the present disclosures;

FIG. 24 is a table of optical data for each lens element of the opticalimaging lens of a sixth embodiment of the present disclosures;

FIG. 25 is a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosures;

FIG. 26 is a table for the values of G₂₃−G₄₅, G_(aa)/T₅, G₂₃/G₁₂ andALT/T₂ of all six example embodiments;

FIG. 27 is a structure of an example embodiment of a mobile device; and

FIG. 28 is a partially enlarged view of the structure of another exampleembodiment of a mobile device.

DETAILED DESCRIPTION OF THE INVENTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentinvention. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the invention. In this respect, as used herein, the term“in” may include “in” and “on”, and the terms “a”, “an” and “the” mayinclude singular and plural references. Furthermore, as used herein, theterm “by” may also mean “from”, depending on the context. Furthermore,as used herein, the term “if” may also mean “when” or “upon”, dependingon the context. Furthermore, as used herein, the words “and/or” mayrefer to and encompass any and all possible combinations of one or moreof the associated listed items.

Example embodiments of an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element, a fourth lenselement, and a fifth lens element arranged sequentially from an objectside to an image side, each of the lens elements has an object-sidesurface facing toward the object side and an image-side surface facingtoward the image side. Example embodiments of the lens as a whole mayonly comprise the five lens elements having refracting power. In anexample embodiment, the first lens element has positive refractingpower, and the object-side surface thereof is a convex surface; thesecond lens element has negative refracting power; the third lenselement has positive refracting power; the image-side surface of thefourth lens element is a convex surface; the object-side surface of thefifth lens element comprises a concave portion in a vicinity of theoptical axis, and the image-side surface of the fifth lens elementcomprises a concave portion in a vicinity of the optical axis and aconvex portion in a vicinity of a periphery of the fifth lens element;and lens as a whole having only the five lens elements having refractingpower.

Preferably, the lens elements are designed in light of the opticalcharacteristics and the length of the optical imaging lens. For example,the first lens element having positive refracting power and the convexobject-side surface has better light converge ability. With an aperturestop positioned before the first lens element to work with the positiverefracting power of the first lens element, the length of the opticalimaging lens could be effectively shortened. The second lens elementhaving negative refracting power could eliminate the aberration of theoptical lens. The third lens element having positive refracting power isable to share the burden of the positive refracting power required inthe optical imaging lens with the first lens element, therefore thesensitivity of the optical lens and inaccuracy in the manufacturingprocess is effectively reduced. With a further concave portion in avicinity of the optical axis on the object-side surface of the thirdlens element, the aberration of the optical lens could be eliminated.The fourth lens element having the image-side convex surface could helpfor light converging. The fifth lens element having the concave portionin a vicinity of the optical axis on the object-side surface thereof andthe concave portion in a vicinity of the optical axis and the convexportion in a vicinity of a periphery of the fifth lens element on theimage-side surface thereof could assist in adjusting the curvature,reducing the high level aberration, and depressing the angle of thechief ray (the incident angle of the light onto the image sensor), andthen the sensitivity of the whole system is promoted.

In another exemplary embodiment, other related parameters, such as acentral thickness of a lens element along the optical axis and or theratio among a central thickness of a lens element along the optical axisand the sum of all air gaps. For example, an air gap between the secondlens element and the third lens element along the optical axis, G₂₃, andan air gap between the fourth lens element and the fifth lens elementalong the optical axis, G₄₅, could be controlled to satisfy the equationas follows:0≤G ₂₃ −G ₄₅ (mm)   Equation (1);0.1≤G ₂₃ −G ₄₅ (mm)   Equation (1′); or0≤G ₂₃ −G ₄₅≤0.2 (mm)   Equation (1″).

For example, the sum of all four air gaps from the first lens element tothe fifth lens element along the optical axis, G_(aa), and a centralthickness of the fifth lens element along the optical axis, T₅, could becontrolled to satisfy the equation as follows:

$\begin{matrix}{{2.3 \leq \frac{G_{aa}}{T_{5}}};{or}} & {{Equation}\mspace{14mu}(2)} \\{2.6 \leq {\frac{G_{aa}}{T_{5}}.}} & {{Equation}\mspace{14mu}\left( 2^{\prime} \right)}\end{matrix}$

For example, G₂₃ and an air gap between the first lens element and thesecond lens element along the optical axis, G₁₂, could be controlled tosatisfy the equation as follows:

$\begin{matrix}{{2 \leq \frac{G_{23}}{G_{12}}};{or}} & {{Equation}\mspace{14mu}(3)} \\{2 \leq \frac{G_{23}}{G_{12}} \leq {7.5.}} & {{Equation}\mspace{14mu}\left( 3^{\prime} \right)}\end{matrix}$

For example, the total thickness of all five lens elements, ALT, and acentral thickness of the second lens element along the optical axis, T₂,could be controlled to satisfy the equation as follows:

$\begin{matrix}{{6.5 \leq \frac{ALT}{T_{2}}};{or}} & {{Equation}\mspace{14mu}(4)} \\{6.5 \leq \frac{ALT}{T_{2}} \leq 10.} & {{Equation}\mspace{14mu}\left( 4^{\prime} \right)}\end{matrix}$

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

Reference is now made to equation (1). Equation (1) could effectivelyavoid from a large air gap G₄₅ and G₄₅ can be smaller because there isno edge resistance between the fourth and fifth lens elements due to theimage-side convex surface of the fourth lens element. When G₂₃−G₄₅ isrestricted in a range from 0 to 0.1, the length of the optical imaginglens could be shortened and the good optical characters could besustained, but the edge resistance between the image-side of the secondlens element and the object-side of the third lens element may beinduced due to the smaller G₂₃, therefore, preferably, equation (1′) issatisfied. Further, equation (1) could be limited by an upper limit tosatisfy equation (1″).

Reference is now made to equation (2). As aforesaid illustration, sincethe fifth lens element is formed with concave portion in a vicinity ofthe optical axis in both object-side and image-side surface, T₅ ispossible to be thinner to shorten the length of the optical lens.Therefore, if equation (2) is not satisfied, it means the shortened T₅is smaller than G_(aa), and this is not benefit to shorten the length ofthe optical lens. Preferably, equation (2) may be further restricted byan upper limit to satisfy equation (2′).

Reference is now made to equation (3). Equation (3) is benefit to theconfiguration for the position of the first, second and third lenselements. If equation (3) is not satisfied, it means that G₁₂ is larger,and this makes the light emitting from the first lens element could notreach a proper height when it enters into the second lens element.Preferably, equation (3′) may be further satisfied.

Reference is now made to equation (4). Equation (4) is benefit to theconfiguration for the thickness of the second lens element and the restlens element. If equation (4) is not satisfied, it means that T₂ isrelatively large. This is not a proper design since an effectivediameter of the second lens element is smaller among all, the thicknessof the second lens element is possible to be thinner. Preferably,equation (4) may be further restricted by an upper limit to satisfyequation (4′).

When implementing example embodiments, more details about the convex orconcave surface structure and/or the refracting power may beincorporated for one specific lens element or broadly for plural lenselements to enhance the control for the system performance and/orresolution, as illustrated in the following embodiments. It is notedthat the details listed herein could be incorporated in exampleembodiments if no inconsistency occurs.

Several exemplary embodiments and associated optical data will now beprovided for illustrating example embodiments of optical imaging lenswith good optical characters and a shortened length. Reference is nowmade to FIGS. 1-5. FIG. 1 illustrates an example cross-sectional view ofan optical imaging lens 1 having five lens elements of the opticalimaging lens according to a first example embodiment. FIG. 2 showsexample charts of longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 1 according to anexample embodiment. FIG. 3 depicts another example cross-sectional viewof a lens element of the optical imaging lens 1 according to an exampleembodiment. FIG. 4 illustrates an example table of optical data of eachlens element of the optical imaging lens 1 according to an exampleembodiment. FIG. 5 depicts an example table of aspherical data of theoptical imaging lens 1 according to an example embodiment.

As shown in FIG. 1, the optical imaging lens 1 of the present embodimentcomprises, in order from an object side A1 to an image side A2, anaperture stop 100, a first lens element 110, a second lens element 120,a third lens element 130, a fourth lens element 140, a fifth lenselement 150. A filtering unit 160 and an image plane 170 of an imagesensor are positioned at the image side A2 of the optical lens 1. Eachof the first, second, third, fourth, fifth lens elements 110, 120, 130,140, 150 and the filtering unit 160 has an object-side surface111/121/131/141/151/161 facing toward the object side A1 and animage-side surface 112/122/132/142/152/162 facing toward the image sideA2. The example embodiment of the filtering unit 160 illustrated is anIR cut filter (infrared cut filter) positioned between the fifth lenselement 150 and an image plane 170. The filtering unit 160 filters lightwith specific wavelength from the light passing optical imaging lens 1.For example, IR light is filtered, and this will prohibit the IR light,which is not visible by human eyes from producing an image on the imageplane 170.

Exemplary embodiments of each lens elements of the optical imaging lens1 will now be described with reference to the drawings.

An example embodiment of the first lens element 110 may have positiverefracting power, which may be constructed by a plastic material. Theobject-side surface 111 and the image-side surface 112 are both convexsurfaces.

The second lens element 120 may have negative refracting power, whichmay be constructed by a plastic material. The object-side surface 121 isa convex surface and the image-side surface 122 is a concave surface.

The third lens element 130 may have positive refracting power, which maybe constructed by a plastic material. The object-side surface 131 is aconcave surface having a concave portion 1311 in a vicinity of theoptical axis. The image-side surface 132 is a convex surface.

The fourth lens element 140 may have positive refracting power, whichmay be constructed by a plastic material. The object-side surface 141 isa concave surface, and the image-side surface 142 is a convex surface.

The fifth lens element 150 may have negative refracting power, which maybe constructed by a plastic material. The object-side surface 141 is aconcave surface comprising a concave portion 1511 in a vicinity of theoptical axis. The image-side surface 152 has a concave portion 1521 in avicinity of the optical axis and a convex portion 1522 in a vicinity ofa periphery of the fifth lens element 150.

In example embodiments, air gaps exist between the lens elements 110,120, 130, 140, 150, the filtering unit 160, and the image plane 170 ofthe image sensor. For example, FIG. 1 illustrates the air gap d1existing between the first lens element 110 and the second lens element120, the air gap d2 existing between the second lens element 120 and thethird lens element 130, the air gap d3 existing between the third lenselement 130 and the fourth lens element 140, the air gap d4 existingbetween the fourth lens element 140 and the fifth lens element 150, theair gap d5 existing between the fifth lens element 150 and the filteringunit 160, and the air gap d6 existing between the filtering unit 160 andthe image plane 170 of the image sensor. However, in other embodiments,any of the aforesaid air gaps may or may not exist. For example, theprofiles of opposite surfaces of any two adjacent lens elements maycorrespond to each other, and in such situation, the air gap may notexist. The air gap d1 is denoted by G₁₂, the air gap d3 is denoted byG₃₄, and the sum of all air gaps d1, d2, d3, d4 between the first andfifth lens elements 110, 150 is denoted by G_(aa).

FIG. 4 depicts the optical characters of each lens elements in theoptical imaging lens 1 of the present embodiment, wherein the values ofG₂₃−G₄₅, G_(aa)/T₅, G₂₃/G₁₂ and ALT/T₂ are:

(G₂₃−G₄₅)=0.11 (mm), satisfying equation (1), (1′), (1″);

(G_(aa)/T₅)=3.22, satisfying equation (2), (2′);

(G₂₃/G₁₂)=3.86, satisfying equation (3), (3′);

(ALT/T₂)=8.34, satisfying equation (4), (4′);

wherein the distance from the object-side convex surface 111 of thefirst lens element 110 to the image plane 170 along the optical axis is4.56 (mm), and the length of the optical imaging lens 1 is shortened.

Please note that, in example embodiments, to clearly illustrate thestructure of each lens element, only the part where light passesthrough, is shown. For example, taking the first lens element 110 as anexample, FIG. 1 illustrates the object-side convex surface 111 and theimage-side convex surface 112. However, when implementing each lenselement of the present embodiment, a fixing part for positioning thelens elements inside the optical imaging lens 1 may be formedselectively. Based on the first lens element 110, please refer to FIG.3, which illustrates the first lens element 110 further comprising afixing part. Here the fixing part is not limited to a protruding part113 extending from the object-side convex surface 111 and the image-sideconvex surface 112 for mounting the first lens element 110 in theoptical imaging lens 1, and ideally, light will not pass through theprotruding part 113.

The aspherical surfaces, including the convex surface 111 and the convexsurface 112 of the first lens element 110, the convex surface 121 andthe concave surface 122 of the second lens element 120, the concavesurface 131 and the convex surface 132 of the third lens element 130,the concave surface 141 and the image-side surface 142 of the fourthlens element 140, and the concave surface 151 and the image-side surface152 of the fifth lens element 150 are all defined by the followingaspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}\;{a_{i} \times \left( \frac{Y}{N} \right)^{i}}}}$

wherein,

R represents the radius of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant;

a_(i) represents the aspherical coefficient of i^(th) level;

and N represents the normalization radius.

The values of each aspherical parameter are shown in FIG. 5.

As illustrated in FIG. 2, the optical imaging lens 1 of the presentexample embodiment shows great characteristics in the longitudinalspherical aberration (a), astigmatism aberration in the sagittaldirection (b), astigmatism aberration in the tangential direction (c),and distortion aberration (d). Therefore, according to aboveillustration, the optical imaging lens 1 of the example embodimentindeed achieves great optical performance and the length of the opticalimaging lens 1 is effectively shortened.

Reference is now made to FIGS. 6-9. FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens 2 having five lenselements of the optical imaging lens according to a second exampleembodiment. FIG. 7 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 2 according to the second example embodiment. FIG. 8 shows anexample table of optical data of each lens element of the opticalimaging lens 2 according to the second example embodiment. FIG. 9 showsan example table of aspherical data of the optical imaging lens 2according to the second example embodiment. The reference numberslabeled in the present embodiment are similar to those in the firstembodiment for the similar elements, but here the reference numbers areinitialed with 2, for example, reference number 211 for labeling theconvex object-side surface of the first lens element, reference number212 for labeling the convex image-side surface of the first lenselement, etc.

As shown in FIG. 6, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2,comprises an aperture stop 200, a first lens element 210, a second lenselement 220, a third lens element 230, a fourth lens element 240, and afifth lens element 250. A filtering unit 260 and an image plane 270 ofan image sensor are positioned at the image side A2 of the optical lens2. Each of the first, second, third, fourth, fifth lens elements 210,220, 230, 240, 250 and the filtering unit 260 has an object-side surface211/221/231/241/251/261 facing toward the object side A1 and animage-side surface 212/222/232/242/252/262 facing toward the image sideA2. The example embodiment of the filtering unit 260 illustrated is anIR cut filter (infrared cut filter) positioned between the fifth lenselement 250 and an image plane 270. The filtering unit 260 filters lightwith specific wavelength from the light passing optical imaging lens 2.For example, IR light is filtered, and this will prohibit the IR lightwhich is not seen by human eyes from producing an image on the imageplane 270.

The differences between the second embodiment and the first embodimentare the thickness of each lens element and the distance of each air gap.Please refer to FIG. 8 for the optical characteristics of each lenselements in the optical imaging lens 2 of the present embodiment,wherein the values of G₂₃−G₄₅, G_(aa)/T₅, G₂₃/G₁₂ and ALT/T₂ are:

(G₂₃−G₄₅)=0.17 (mm), satisfying equation (1), (1′), (1″);

(G_(aa)/T₅)=3.67, satisfying equation (2), (2′);

(G₂₃/G₁₂)=6.70, satisfying equation (3), (3′);

(ALT/T₂)=8.17, satisfying equation (4), (4′);

wherein the distance from the object side surface 211 of the first lenselement 210 to the image plane 270 is 4.50 (mm) and the length of theoptical imaging lens 2 is shortened.

As shown in FIG. 7, the optical imaging lens 2 of the present embodimentshows great characteristics in longitudinal spherical aberration (a),astigmatism in the sagittal direction (b), astigmatism in the tangentialdirection (c), and distortion aberration (d). Therefore, according tothe above illustration, the optical imaging lens of the presentembodiment indeed shows great optical performance and the length of theoptical imaging lens 2 is effectively shortened.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 3 having five lenselements of the optical imaging lens according to a third exampleembodiment. FIG. 11 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 3 according to the third example embodiment. FIG. 12 shows anexample table of optical data of each lens element of the opticalimaging lens 3 according to the third example embodiment. FIG. 13 showsan example table of aspherical data of the optical imaging lens 3according to the third example embodiment. The reference numbers labeledin the present embodiment are similar to those in the first embodimentfor the similar elements, but here the reference numbers are initialedwith 3, for example, reference number 311 for labeling the convexobject-side surface of the first lens element, reference number 312 forlabeling the convex image-side surface of the first lens element, etc.

As shown in FIG. 10, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2,comprises an aperture stop 300, a first lens element 310, a second lenselement 320, a third lens element 330, a fourth lens element 340, and afifth lens element 350. A filtering unit 360 and an image plane 370 ofan image sensor are positioned at the image side A2 of the optical lens2. Each of the first, second, third, fourth, fifth lens elements 310,320, 330, 340, 350 and the filtering unit 360 has an object-side surface311/321/331/341/351/361 facing toward the object side A1 and animage-side surface 312/322/332/342/352/362 facing toward the image sideA2. The example embodiment of the filtering unit 360 illustrated is anIR cut filter (infrared cut filter) positioned between the fifth lenselement 350 and an image plane 370. The filtering unit 360 filters lightwith specific wavelength from the light passing optical imaging lens 3.For example, IR light is filtered, and this will prohibit the IR lightwhich is not seen by human eyes from producing an image on the imageplane 370.

The differences between the second embodiment and the first embodimentare the thickness of each lens element and the distance of each air gap.Please refer to FIG. 12 for the optical characteristics of each lenselements in the optical imaging lens 3 of the present embodiment,wherein the values of G₂₃−G₄₅, G_(aa)/T₅, G₂₃/G₁₂ and ALT/T₂ are:

(G₂₃−G₄₅)=0.05 (mm), satisfying equation (1), (1″);

(G_(aa)/T₅)=3.37, satisfying equation (2), (2′);

(G₂₃/G₁₂)=2.80, satisfying equation (3), (3′);

(ALT/T₂)=8.15, satisfying equation (4), (4′);

wherein the distance from the object side surface 311 of the first lenselement 310 to the image plane 370 is 4.45 (mm) and the length of theoptical imaging lens 3 is shortened.

As shown in FIG. 11, the optical imaging lens 3 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 3 is effectively shortened.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 4 having five lenselements of the optical imaging lens according to a fourth exampleembodiment. FIG. 15 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 4 according to the fourth embodiment. FIG. 16 shows an exampletable of optical data of each lens element of the optical imaging lens 4according to the fourth example embodiment. FIG. 17 shows an exampletable of aspherical data of the optical imaging lens 4 according to thefourth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 4, forexample, reference number 411 for labeling the convex object-sidesurface of the first lens element, reference number 412 for labeling theconvex image-side surface of the first lens element, etc.

As shown in FIG. 14, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2,comprises an aperture stop 400, a first lens element 410, a second lenselement 420, a third lens element 430, a fourth lens element 440, and afifth lens element 450. A filtering unit 460 and an image plane 470 ofan image sensor are positioned at the image side A2 of the optical lens4. Each of the first, second, third, fourth, fifth lens elements 410,420, 430, 440, 450 and the filtering unit 460 has an object-side surface411/421/431/441/451/461 facing toward the object side A1 and animage-side surface 412/422/432/442/452/462 facing toward the image sideA2. The example embodiment of the filtering unit 460 illustrated is anIR cut filter (infrared cut filter) positioned between the fifth lenselement 450 and an image plane 470. The filtering unit 460 filters lightwith specific wavelength from the light passing optical imaging lens 4.For example, IR light is filtered, and this will prohibit the IR light,which is not visible by human eyes from producing an image on the imageplane 470.

The differences between the fourth embodiment and the first embodimentare the thickness of each lens element and the distance of each air gap.Please refer to FIG. 16 for the optical characteristics of each lenselements in the optical imaging lens 4 of the present embodiment,wherein the values of G₂₃−G₄₅, G_(aa)/T₅, G₂₃/G₁₂ and ALT/T₂ are:

(G₂₃−G₄₅)=0.02 (mm), satisfying equation (1), (1″);

(G_(aa)/T₅)=4.53, satisfying equation (2), (2′);

(G₂₃/G₁₂)=5.40, satisfying equation (3), (3′);

(ALT/T₂)=7.69, satisfying equation (4), (4′);

wherein the distance from the object side surface 411 of the first lenselement 410 to the image plane 470 is 4.57 (mm) and the length of theoptical imaging lens 4 is shortened.

As shown in FIG. 15, the optical imaging lens 4 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 4 is effectively shortened.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 5 having five lenselements of the optical imaging lens according to a fifth exampleembodiment. FIG. 19 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 5 according to the fifth embodiment. FIG. 20 shows an example tableof optical data of each lens element of the optical imaging lens 5according to the fifth example embodiment. FIG. 21 shows an exampletable of aspherical data of the optical imaging lens 5 according to thefifth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 5, forexample, reference number 511 for labeling the convex object-sidesurface of the first lens element, reference number 512 for labeling theconcave image-side surface of the first lens element, etc.

As shown in FIG. 18, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2,comprises an aperture stop 500 positioned in front of a first lenselement 510, a second lens element 520, a third lens element 530, afourth lens element 540, and a fifth lens element 550. A filtering unit560 and an image plane 570 of an image sensor are positioned at theimage side A2 of the optical lens 5. Each of the first, second, third,fourth, fifth lens elements 510, 520, 530, 540, 550 and the filteringunit 560 has an object-side surface 511/521/531/541/551/561 facingtoward the object side A1 and an image-side surface512/522/532/542/552/562 facing toward the image side A2. The exampleembodiment of the filtering unit 560 illustrated is an IR cut filter(infrared cut filter) positioned between the fifth lens element 550 andan image plane 570. The filtering unit 560 filters light with specificwavelength from the light passing optical imaging lens 5. For example,IR light is filtered, and this will prohibit the IR light, which is notseen by human eyes from producing an image on the image plane 570.

The differences between the fifth embodiment and the first embodimentare the thickness of each lens element, the distance of each air gap,and the curve shape, such as the image-side surface 512 of the firstlens element 510 and the object-side and image-side surfaces 531, 532 ofthe third lens element 530. The image-side surface 512 of the first lenselement 510 is a concave surface. The object-side surface 531 of thethird lens element 530 has a convex portion 5311 in a vicinity of theoptical axis and a concave portion 5312 in a vicinity of a periphery ofthe fifth lens element 530, and the image-side surface 532 of the thirdlens element 530 has a concave portion 5321 in a vicinity of the opticalaxis and a convex portion 5322 in a vicinity of a periphery of the fifthlens element 530. Please refer to FIG. 20 for the opticalcharacteristics of each lens elements in the optical imaging lens 5 ofthe present embodiment, wherein the values of G₂₃−G₄₅, G_(aa)/T₅,G₂₃/G₁₂ and ALT/T₂ are:

(G₂₃−G₄₅)=0.04 (mm), satisfying equation (1), (1″);

(G_(aa)/T₅)=2.61, satisfying equation (2), (2′);

(G₂₃/G₁₂)=3.37, satisfying equation (3), (3′);

(ALT/T₂)=8.16, satisfying equation (4), (4′);

wherein the distance from the object side surface 511 of the first lenselement 510 to the image plane 570 is 4.26 (mm) and the length of theoptical imaging lens 5 is shortened.

As shown in FIG. 19, the optical imaging lens 5 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 5 is effectively shortened.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 6 having five lenselements of the optical imaging lens according to a sixth exampleembodiment. FIG. 23 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 6 according to the sixth embodiment. FIG. 24 shows an example tableof optical data of each lens element of the optical imaging lens 6according to the sixth example embodiment. FIG. 25 shows an exampletable of aspherical data of the optical imaging lens 6 according to thesixth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 6, forexample, reference number 611 for labeling the convex object-sidesurface of the first lens element, reference number 612 for labeling theconvex image-side surface of the first lens element, etc.

As shown in FIG. 22, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2,comprises an aperture stop 600, a second lens element 620, a third lenselement 630, a fourth lens element 640, and a fifth lens element 650. Afiltering unit 660 and an image plane 670 of an image sensor arepositioned at the image side A2 of the optical lens 6. Each of thefirst, second, third, fourth, fifth lens elements 610, 620, 630, 640,650 and the filtering unit 660 has an object-side surface611/621/631/641/651/661 facing toward the object side A1 and animage-side surface 612/622/632/642/652/662 facing toward the image sideA2. The example embodiment of the filtering unit 660 illustrated is anIR cut filter (infrared cut filter) positioned between the fifth lenselement 650 and an image plane 670. The filtering unit 660 filters lightwith specific wavelength from the light passing optical imaging lens 6.For example, IR light is filtered, and this will prohibit the IR lightwhich is not visible by human eyes from producing an image on the imageplane 670.

The differences between the sixth embodiment and the first embodimentare the thickness of each lens element and the distance of each air gap.Please refer to FIG. 24 for the optical characteristics of each lenselements in the optical imaging lens 6 of the present embodiment,wherein the values of G₂₃−G₄₅, G_(aa)/T₅, G₂₃/G₁₂ and ALT/T₂ are:

(G₂₃−G₄₅)=0.03 (mm), satisfying equation (1), (1″);

(G_(aa)/T₅)=6.27, satisfying equation (2), (2′);

(G₂₃/G₁₂)=3.62, satisfying equation (3), (3′);

(ALT/T₂)=6.99, satisfying equation (4), (4′);

wherein the distance from the object side surface 611 of the first lenselement 610 to the image plane 670 is 4.35 (mm) and the length of theoptical imaging lens 6 is shortened.

As shown in FIG. 23, the optical imaging lens 6 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 6 is effectively shortened.

Please refer to FIG. 26, which shows the values of G₂₃−G₄₅, G_(aa)/T₅,G₂₃/G₁₂ and ALT/T₂ of all six embodiments, and it is clear that theoptical imaging lens of the present invention satisfy the Equations(1)/(1′)/(1″), (2)/(2′), (3)/(3′), (4)/(4′).

Reference is now made to FIG. 27, which illustrates an examplestructural view of a first embodiment of mobile device 20 applying anaforesaid optical imaging lens. The mobile device 20 comprises a housing21 and a photography module 22 positioned in the housing 21. An exampleof the mobile device 20 may be, but is not limited to, a mobile phone.

As shown in FIG. 27, the photography module 22 may comprise an aforesaidoptical imaging lens with five lens elements, for example the opticalimaging lens 1 of the first embodiment, a lens barrel 23 for positioningthe optical imaging lens 1, a module housing unit 24 for positioning thelens barrel 23, and an image sensor 171 which is positioned at an imageside of the optical imaging lens 1. The image plane 170 is formed on theimage sensor 171.

In some other example embodiments, the structure of the filtering unit160 may be omitted. In some example embodiments, the housing 21, thelens barrel 23, and/or the module housing unit 24 may be integrated intoa single component or assembled by multiple components. In some exampleembodiments, the image sensor 171 used in the present embodiment isdirectly attached to a substrate 172 in the form of a chip on board(COB) package, and such package is different from traditional chip scalepackages (CSP) since COB package does not require a cover glass beforethe image sensor 171 in the optical imaging lens 1. Aforesaid exemplaryembodiments are not limited to this package type and could beselectively incorporated in other described embodiments.

The five lens elements 110, 120, 130, 140, 150 are positioned in thelens barrel 23 in the way of separated by an air gap between any twoadjacent lens elements.

The module housing unit 24 comprises a lens backseat 2401 and an imagesensor base 2406 positioned between the lens backseat 2401 and the imagesensor 171. The lens barrel 23 and the lens backseat 2401 are positionedalong a same axis I-I′, and the lens barrel 23 is positioned inside thelens backseat 2401.

Because the length of the optical imaging lens 1 is merely 4.56 (mm),the size of the mobile device 20 may be quite small. Therefore, theembodiments described herein meet the market demand for smaller sizedproduct designs.

Reference is now made to FIG. 28, which shows another structural view ofa second embodiment of mobile device 20′ applying the aforesaid opticalimaging lens 1. One difference between the mobile device 20′ and themobile device 20 may be the lens backseat 2401 comprises a first seatelement 2402, a second seat element 2403, a coil 2404, and a magneticunit 2405. The first seat element 2402 is close to the outside of thelens barrel 23, and positioned along an axis I-I′, and the second seatelement 2403 is around the outside of the first seat element 2402 andpositioned along with the axis I-I′. The coil 2404 is positioned betweenthe first seat element 2402 and the inside of the second seat element2403. The magnetic unit 2405 is positioned between the outside of thecoil 2404 and the inside of the second seat element 2403.

The lens barrel 23 and the optical imaging lens 1 positioned therein aredriven by the first seat element 2402 for moving along the axis I-I′.The sensor backseat 2406 is close to the second seat element 2403. Thefiltering unit 160, for example an IR cut filter, is positioned on thesensor backseat 2406. The rest structure of the mobile device 20′ issimilar to the mobile device 20.

Similarly, because the length of the optical imaging lens 1, 4.56 (mm),is shortened, the mobile device 20′ may be designed with a smaller sizeand meanwhile good optical performance is still provided. Therefore, thepresent embodiment meets the demand of small sized product design andthe request of the market.

According to above illustration, it is clear that the mobile device andthe optical imaging lens thereof in example embodiments, throughcontrolling the ratio of at least one central thickness of lens elementto a sum of all air gaps along the optical axis between five lenselements in a predetermined range, and incorporated with detailstructure and/or reflection power of the lens elements, the length ofthe optical imaging lens is effectively shortened and meanwhile goodoptical characteristics are still provided.

While various embodiments in accordance with the disclosed principleshave been described above, it should be understood that they have beenpresented by way of example only, and are not limiting. Thus, thebreadth and scope of exemplary embodiment(s) should not be limited byany of the above-described embodiments, but should be defined only inaccordance with the claims and their equivalents issuing from thisdisclosure. Furthermore, the above advantages and features are providedin described embodiments, but shall not limit the application of suchissued claims to processes and structures accomplishing any or all ofthe above advantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, sequentially from anobject side to an image side, comprising first, second, third, fourth,and fifth lens elements, each of the first, second, third, fourth, andfifth lens elements having an object-side surface facing toward theobject side and an image-side surface facing toward the image side,wherein: the first lens element is made of plastic; the object-sidesurface of the second lens element has a convex portion in a vicinity ofthe optical axis; the third lens element is made of plastic; theobject-side surface of the fourth lens element has a concave portion ina vicinity of a periphery of the fourth lens element; the object-sidesurface of the fifth lens element has a concave portion in a vicinity ofthe optical axis; and the optical imaging lens as a whole has only thefive lens elements having refractive power; wherein a sum of centralthicknesses of all five lens elements along the optical axis is ALT, adistance between the image-side surface of the fifth lens element and animage plane along the optical axis is BFL, and the optical imaging lenssatisfies the equation:1.167≤ALT/BFL≤1.685.
 2. The optical imaging lens according to claim 1,wherein a central thickness of the fourth lens element along the opticalaxis is T₄, an air gap between the first lens element and the secondlens element along the optical axis is G₁₂, a central thickness of thesecond lens element along the optical axis is T₂, and the opticalimaging lens satisfies the equation:1.638≤T ₄/(G ₁₂ +T ₂)≤2.158.
 3. The optical imaging lens according toclaim 1, wherein a sum of all four air gaps from the first lens elementto the fifth lens element along the optical axis is G_(aa), a centralthickness of the fourth lens element along the optical axis is T₄, andthe optical imaging lens satisfies the equation:1.363≤G _(aa) /T ₄≤2.148.
 4. The optical imaging lens according to claim1, wherein an effective focal length of the optical imaging lens is f,an air gap between the first lens element and the second lens elementalong the optical axis is G₁₂, a central thickness of the fourth lenselement along the optical axis is T₄, and the optical imaging lenssatisfies the equation:3.927≤f/(G ₁₂ +T ₄)≤6.034.
 5. The optical imaging lens according toclaim 1, wherein a central thickness of the first lens element along theoptical axis is T₁, a central thickness of the fourth lens element alongthe optical axis is T₄, an air gap between the first lens element andthe second lens element along the optical axis is G₁₂, an air gapbetween the third lens element and the fourth lens element along theoptical axis is G₃₄, and the optical imaging lens satisfies theequation:1.816≤(T ₁ +T ₄)/(G ₁₂ +G ₃₄)≤2.802.
 6. The optical imaging lensaccording to claim 1, wherein a distance between the object-side surfaceof the first lens element and an the image-side surface of the fifthlens element along the optical axis is TL, an air gap between the fourthlens element and the fifth lens element along the optical axis is G₄₅, acentral thickness of the fifth lens element along the optical axis isT₅, and the optical imaging lens satisfies the equation:4.362≤TL/(G ₄₅ +T ₅)≤5.685.
 7. The optical imaging lens according toclaim 1, wherein a sum of all four air gaps from the first lens elementto the fifth lens element along the optical axis is G_(aa), an air gapbetween the first lens element and the second lens element along theoptical axis is G₁₂, an air gap between the second lens element and thethird lens element along the optical axis is G₂₃, and the opticalimaging lens satisfies the equation:2.122≤G _(aa)/(G ₁₂ +G ₂₃)≤2.719.
 8. The optical imaging lens accordingto claim 1, wherein a central thickness of the first lens element alongthe optical axis is T₁, a central thickness of the fourth lens elementalong the optical axis is T₄, a central thickness of the third lenselement along the optical axis is T₃, and the optical imaging lenssatisfies the equation:3.104≤(T ₁ +T ₄)/T ₃≤3.663.
 9. The optical imaging lens according toclaim 1, wherein a distance between the object-side surface of the firstlens element and the image plane along the optical axis is TTL, a sum ofall four air gaps from the first lens element to the fifth lens elementalong the optical axis is G_(aa), and the optical imaging lens satisfiesthe equation:3.584≤TTL/G _(aa)≤4.133.
 10. The optical imaging lens according to claim1, wherein an air gap between the third lens element and the fourth lenselement along the optical axis is G₃₄, an air gap between the fourthlens element and the fifth lens element along the optical axis is G₄₅,and the optical imaging lens satisfies the equation:2.263≤ALT/(G ₃₄ +G ₄₅)≤3.467.
 11. The optical imaging lens according toclaim 1, wherein a central thickness of the fourth lens element alongthe optical axis is T₄, a central thickness of the fifth lens elementalong the optical axis is T₅, an air gap between the fourth lens elementand the fifth lens element along the optical axis is G₄₅, and theoptical imaging lens satisfies the equation:2.336≤(T ₄ +T ₅)/G ₄₅≤3.768.
 12. The optical imaging lens according toclaim 1, wherein a sum of all four air gaps from the first lens elementto the fifth lens element along the optical axis is G_(aa), and theoptical imaging lens satisfies the equation:1.431≤ALT/G _(aa)≤1.966.
 13. The optical imaging lens according to claim1, wherein a central thickness of the fourth lens element along theoptical axis is T₄, a central thickness of the second lens element alongthe optical axis is T₂, and the optical imaging lens satisfies theequation:2.274≤T ₄ /T ₂≤3.046.
 14. The optical imaging lens according to claim 1,wherein a sum of all four air gaps from the first lens element to thefifth lens element along the optical axis is G_(aa), a central thicknessof the first lens element along the optical axis is T₁, a centralthickness of the fifth lens element along the optical axis is T₅, andthe optical imaging lens satisfies the equation:1.302≤G _(aa)/(T ₁ +T ₅)≤1.996.
 15. The optical imaging lens accordingto claim 1, wherein a central thickness of the first lens element alongthe optical axis is T₁, an air gap between the fourth lens element andthe fifth lens element along the optical axis is G₄₅, and the opticalimaging lens satisfies the equation:1.019≤T ₁ /G ₄₅≤1.956.
 16. The optical imaging lens according to claim1, wherein a central thickness of the second lens element along theoptical axis is T₂, an air gap between the fourth lens element and thefifth lens element along the optical axis is G₄₅, and the opticalimaging lens satisfies the equation:3.029≤ALT/(T ₂ +G ₄₅)≤4.029.
 17. The optical imaging lens according toclaim 1, wherein a central thickness of the fifth lens element along theoptical axis is T₅, an air gap between the third lens element and thefourth lens element along the optical axis is G₃₄, and the opticalimaging lens satisfies the equation:3.804≤(T ₅ +BFL)/G ₃₄≤5.729.
 18. The optical imaging lens according toclaim 1, wherein a central thickness of the third lens element along theoptical axis is T₃, a central thickness of the fifth lens element alongthe optical axis is T₅, an air gap between the first lens element andthe second lens element along the optical axis is G₁₂, an air gapbetween the third lens element and the fourth lens element along theoptical axis is G₃₄, and the optical imaging lens satisfies theequation:0.946≤(T ₃ +T ₅)/(G ₁₂ +G ₃₄)≤1.864.
 19. The optical imaging lensaccording to claim 1, wherein an air gap between the third lens elementand the fourth lens element along the optical axis is G₃₄, a centralthickness of the fifth lens element along the optical axis is T₅, acentral thickness of the first lens element along the optical axis isT₁, and the optical imaging lens satisfies the equation:1.340≤(G ₃₄ +T ₅)/T ₁≤2.165.
 20. The optical imaging lens according toclaim 1, wherein an air gap between the first lens element and thesecond lens element along the optical axis is G₁₂, an air gap betweenthe third lens element and the fourth lens element along the opticalaxis is G₃₄, a central thickness of the second lens element along theoptical axis is T₂, and the optical imaging lens satisfies the equation:1.535≤(G ₁₂ +G ₃₄)/T ₂≤2.215.